[PROBLEM] Multichannel audio issue

[Tim Curtis]

When I play the Pink Floyd track on my Yamaha 5.1 AVR I don't hear anything from the rear surrounds. I have a couple of other multichannel flac files and all 6 channels produce sound.

I don't have any experience analyzing multichannel files to determine how they are encoded and why some channels don't play or are swapped or ??. Maybe someone with expertise in this area can help out.